| 摘要 |
A pipe coupling for connection with at least one pipe to form a central vacuum cleaning pipeline comprises at least a first and a second opening defined by an envelope wall, which comprises an inner and an outer surface. At least said first opening is arranged to receive a pipe introduced into said first opening along a first insertion and retraction direction, so that the pipe coupling overlaps the pipe with a part of the inner surface of the pipe coupling at an attachment section. The attachment section comprises an annular seal member arranged in the attachment section to effectively seal between the inner surface of the pipe coupling and the outer surface of said pipe. The attachment section further comprises an annular recess which defines a stop surface and which is configured to form a smooth transition between the pipe and the pipe coupling to reduce noise pollution. |
